AsyncWorldEdit error

[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] ***********************************
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] Error while processing async operation replaceBlocks
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] ***********************************
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * Exception: java.lang.IllegalArgumentException
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * Error message: org.primesoft.asyncworldedit.utils.SessionCanceled
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * Stack:
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.primesoft.asyncworldedit.worldedit.CancelabeEditSession.getBlock(CancelabeEditSession.java:145)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * com.sk89q.worldedit.function.mask.BlockMask.test(BlockMask.java:97)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * com.sk89q.worldedit.function.RegionMaskingFilter.apply(RegionMaskingFilter.java:53)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * com.sk89q.worldedit.function.visitor.RegionVisitor.resume(RegionVisitor.java:55)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * com.sk89q.worldedit.function.operation.Operations$2.Execute(Operations.java:70)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.primesoft.asyncworldedit.injector.async.AsyncOperationProcessor$1.task(AsyncOperationProcessor.java:137)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.primesoft.asyncworldedit.worldedit.AsyncTask.doRun(AsyncTask.java:62)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.primesoft.asyncworldedit.worldedit.BaseTask.run(BaseTask.java:138)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] * java.lang.Thread.run(Thread.java:745)
[13:05:41] [Craft Scheduler Thread - 405/INFO]: [AsyncWorldEdit] ***********************************